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Pipe roofing in tunnels.
The installation of the support utilizes the area around the crown and sides of the tunnel wall.
As with roofs explorers bypass locks to enter mechanical rooms and the connected tunnels.
In these areas tunneling can cause ground settlement endangering buildings and other structures on the surface as well as the people working inside the tunnel.
Pre support in tunnel construction is becoming increasingly important as transportation systems expand and more and more roads and railways have to be run through areas of unstable ground.
Tunnel access points tend to be in locked mechanical rooms where steam pipes and other utilities enter a building and through manholes.
Some adventurers may open manholes from above with crowbars or specialized manhole opening hooks.
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The answer is pipe roofing the technique of pre reinforcing the ground ahead of the tunnel face to ensure that the excavation can proceed.
Pipe roof is one of the tunnel support system used during a shallow tunnel construction.